Azo dye.



.UNITED STATES PATENT OFFICE.

WALTER KCNIG, 0F i-ILBHRFELD, Gl-IRXMNY, ASSIGXOR T0 FARBENFABRIKEN YORK. FIHI'ZDR. BAYER & (0., OF l'lLlll-IRFELD, GBIUIANY, A CORPORATION OF GERMANY.

AZO DYE.

To all whom it may concern:

Be it. known that I, WALTER Koxio, doctor of technical arts. chemist, citizen of the German Empire, residing at Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Iiii rovoments in New Azo l) 'cs,uf which the f0 iowingis a specification.

.\iy invention relates to the preparation of new azo-dycstull's. They are obtained by combining in alkaline solution the diazocompounds of iuiplithylamin compounds with l-ainino-7-naphthol-4-siilfoiiic acids having the following general formula:

(X and Y stand for hydrogen ora substituent e. g. benzyl, methyl, ethyl etc.)

The new dyestuffs are in the shape of their alkaline salts dark powders-soluble in water;

rid and iydrochloric acid naphthylamin compounds and 1.8di'an1in0-7 naplithol-4- sulfonic acid compounds of the formula (X and Y stand for hydrogen or a substitu out). They are acid dyeing colors of strong covering power, producing on wool very level violet to deep black shades of good fastnew to washing. The cotton in mixed cotdried. It is, after being dried and pulver izcd. iii the shape of its sodium salt a dark Specification of Letters Patent. Application flied May 12, 1900. semi No. 432mm.

yielding u on reduction with stannous chlo-' Patented Sept. 22, 1908'.

1) l-naphthylamln 2) l-naphthyinmin-taiiltonkz 8) l-nnphthylaminA-snltonic acid Yiolet-hlack 0! I reddish tint Deep brown-red Black 1.1aintnonaphtha-L sulronic The alkylated derivatives can be obtained by treatin .1-amino-7 -napbthol-4 -sulfonic acid with alogen alkyls or dialkyl sulfates and sodium acetate etc.

Having now described my invention and in what manner the same is to be performed, what I claim as newand desire to secure by Letters Patent is:

1. The herein-described new azo dyestuffs, obtainable by combining in alkaline solution naphthylamin compounds with 1-amino-7- naphtholt-snlfonie acids having the above iven formula, which dvestufis are, after bein dried and pulverized in the shape of their al 'uline salts dark powders soluble in water' yielding upon reduction with staiinous chloriil and hydrochloric acid naphthylamin coniminds and 1.8-diangino -7-naphtl ol -4 -suli onic acids having the formula 'x an, n( OHM T \I to A $018 I and dyeing wool from acid baths generally from violet to black shades, substantially as described.

2.- The herein-described new amdyestufi obtainable by combining in alkaline solution Deep reddish-viola. I

dyutull is, after brin dn'l'd and pulveriled, in the ah In testimony whom! l luve heieuntn u-t I npnof mam numsnlt lurk \vcler m hnnd in the romance of two nulmribi I I noluble in water with I. n-dwiolut on or gm] w tnmp.

soluble in mncmlrul-ed nulfun'n acid with n WM Row with llunnnuu chlurid and Ey rocluloric mid 'ilm l-mvhthyluainamlLU-diaminq-T-mphthob' 10 4-;u Ionic mid; anddyeing \IIII from mid Wu Kbsm, Wunmoms BRUNBWIIUK. 

